x86: coreboot: Add generic coreboot payload support

Currently building U-Boot as the coreboot payload requires user
to change the build configuration for a specific board during
menuconfig process. This uses the board's native device tree
to configure the hardware. For example, the device tree provides
PCI address range for the PCI host controller and U-Boot will
re-program all PCI devices' BAR to be within this range. In order
to make sure we don't mess up the hardware, we should guarantee
the range matches what coreboot programs the chipset.

But we really should make the coreboot payload support easier.
Just like EFI payload, we can create a generic coreboot payload
for all x86 boards as well. The payload is configured to include
as many generic drivers as possible. All stuff that touches low
level initialization are not allowed as such is the coreboot's
responsibility. Platform specific drivers (like gpio, spi, etc)
are not included.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

arch/x86/cpu/coreboot/Kconfig

@@ -3,26 +3,26 @@ if TARGET_COREBOOT
 config SYS_COREBOOT
 	bool
 	default y
+	imply SYS_NS16550
+	imply SCSI
+	imply SCSI_AHCI
 	imply AHCI_PCI
-	imply E1000
-	imply ICH_SPI
 	imply MMC
 	imply MMC_PCI
 	imply MMC_SDHCI
 	imply MMC_SDHCI_SDMA
-	imply SCSI
-	imply SCSI_AHCI
-	imply SPI_FLASH
-	imply SYS_NS16550
 	imply USB
 	imply USB_EHCI_HCD
 	imply USB_XHCI_HCD
+	imply USB_STORAGE
+	imply USB_KEYBOARD
 	imply VIDEO_COREBOOT
+	imply E1000
+	imply ETH_DESIGNWARE
+	imply PCH_GBE
+	imply RTL8169
 	imply CMD_CBFS
 	imply FS_CBFS
-
-config CBMEM_CONSOLE
-	bool
-	default y
+	imply CBMEM_CONSOLE
 
 endif

arch/x86/cpu/coreboot/coreboot.c

@@ -7,6 +7,7 @@
 
 #include <common.h>
 #include <fdtdec.h>
+#include <usb.h>
 #include <asm/io.h>
 #include <asm/msr.h>
 #include <asm/mtrr.h>
@@ -75,12 +76,10 @@ int last_stage_init(void)
 	if (gd->flags & GD_FLG_COLD_BOOT)
 		timestamp_add_to_bootstage();
 
-	board_final_cleanup();
+	/* start usb so that usb keyboard can be used as input device */
+	usb_init();
 
-	return 0;
-}
+	board_final_cleanup();
 
-int misc_init_r(void)
-{
 	return 0;
 }

arch/x86/dts/Makefile

@@ -6,6 +6,7 @@ dtb-y += bayleybay.dtb \
 	chromebox_panther.dtb \
 	chromebook_samus.dtb \
 	conga-qeval20-qa3-e3845.dtb \
+	coreboot.dtb \
 	cougarcanyon2.dtb \
 	crownbay.dtb \
 	dfi-bt700-q7x-151.dtb \

arch/x86/dts/coreboot.dts

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Generic coreboot payload device tree for x86 targets
+ */
+
+/dts-v1/;
+
+/include/ "skeleton.dtsi"
+/include/ "serial.dtsi"
+/include/ "keyboard.dtsi"
+/include/ "reset.dtsi"
+/include/ "rtc.dtsi"
+/include/ "tsc_timer.dtsi"
+
+/ {
+	model = "coreboot x86 payload";
+	compatible = "coreboot,x86-payload";
+
+	aliases {
+		serial0 = &serial;
+	};
+
+	config {
+		silent_console = <0>;
+	};
+
+	chosen {
+		stdout-path = "/serial";
+	};
+
+	pci {
+		compatible = "pci-x86";
+		u-boot,dm-pre-reloc;
+	};
+
+	coreboot-fb {
+		compatible = "coreboot-fb";
+	};
+};

board/coreboot/coreboot/Kconfig

@@ -9,35 +9,15 @@ config SYS_VENDOR
 config SYS_SOC
 	default "coreboot"
 
+config SYS_CONFIG_NAME
+	default "coreboot"
+
 config SYS_TEXT_BASE
 	default 0x01110000
 
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
-	imply SPI_FLASH_ATMEL
-	imply SPI_FLASH_EON
-	imply SPI_FLASH_GIGADEVICE
-	imply SPI_FLASH_MACRONIX
-	imply SPI_FLASH_SPANSION
-	imply SPI_FLASH_STMICRO
-	imply SPI_FLASH_SST
-	imply SPI_FLASH_WINBOND
-
-comment "coreboot-specific options"
-
-config SYS_CONFIG_NAME
-	string "Board configuration file"
-	default "qemu-x86"
-	help
-	  This option selects the board configuration file in include/configs/
-	  directory to be used to build U-Boot for coreboot.
-
-config DEFAULT_DEVICE_TREE
-	string "Board Device Tree Source (dts) file"
-	default "qemu-x86_i440fx"
-	help
-	  This option selects the board Device Tree Source (dts) file in
-	  arch/x86/dts/ directory to be used to build U-Boot for coreboot.
+	select BOARD_EARLY_INIT_R
 
 config SYS_CAR_ADDR
 	hex "Board specific Cache-As-RAM (CAR) address"

board/coreboot/coreboot/Makefile

@@ -10,4 +10,4 @@
 # (C) Copyright 2002
 # Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
 
-obj-y	+= coreboot_start.o
+obj-y	+= start.o coreboot.o

board/coreboot/coreboot/coreboot.c

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+#include <common.h>
+
+int board_early_init_r(void)
+{
+	/*
+	 * Make sure PCI bus is enumerated so that peripherals on the PCI bus
+	 * can be discovered by their drivers
+	 */
+	pci_init();
+
+	return 0;
+}

configs/coreboot_defconfig

@@ -4,28 +4,25 @@ CONFIG_VENDOR_COREBOOT=y
 CONFIG_TARGET_COREBOOT=y
 CONFIG_NR_DRAM_BANKS=8
 CONFIG_FIT=y
-CONFIG_BOOTSTAGE=y
-CONFIG_BOOTSTAGE_REPORT=y
+CONFIG_FIT_SIGNATURE=y
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="root=/dev/sdb3 init=/sbin/init rootwait ro"
+CONFIG_PRE_CONSOLE_BUFFER=y
+CONFIG_PRE_CON_BUF_ADDR=0x100000
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_LAST_STAGE_INIT=y
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_IDE=y
+CONFIG_CMD_MMC=y
 CONFIG_CMD_PART=y
-CONFIG_CMD_SF=y
-CONFIG_CMD_SPI=y
 CONFIG_CMD_USB=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DHCP=y
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_PING=y
 CONFIG_CMD_TIME=y
-CONFIG_CMD_BOOTSTAGE=y
-CONFIG_CMD_TPM=y
-CONFIG_CMD_TPM_TEST=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
@@ -34,11 +31,8 @@ CONFIG_CMD_FS_GENERIC=y
 CONFIG_MAC_PARTITION=y
 CONFIG_ISO_PARTITION=y
 CONFIG_EFI_PARTITION=y
+CONFIG_DEFAULT_DEVICE_TREE="coreboot"
 CONFIG_REGMAP=y
 CONFIG_SYSCON=y
-CONFIG_SPI=y
-CONFIG_TPM_TIS_LPC=y
-CONFIG_USB_STORAGE=y
-CONFIG_USB_KEYBOARD=y
+# CONFIG_PCI_PNP is not set
 CONFIG_CONSOLE_SCROLL_LINES=5
-CONFIG_TPM=y

doc/README.x86

@@ -47,21 +47,6 @@ on other architectures, like below:
 $ make coreboot_defconfig
 $ make all
 
-Note this default configuration will build a U-Boot payload for the QEMU board.
-To build a coreboot payload against another board, you can change the build
-configuration during the 'make menuconfig' process.
-
-x86 architecture  --->
-	...
-	(qemu-x86) Board configuration file
-	(qemu-x86_i440fx) Board Device Tree Source (dts) file
-	(0x01920000) Board specific Cache-As-RAM (CAR) address
-	(0x4000) Board specific Cache-As-RAM (CAR) size
-
-Change the 'Board configuration file' and 'Board Device Tree Source (dts) file'
-to point to a new board. You can also change the Cache-As-RAM (CAR) related
-settings here if the default values do not fit your new board.
-
 Build Instructions for U-Boot as main bootloader
 ------------------------------------------------
 

include/configs/coreboot.h

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+/*
+ * board/config.h - configuration options, board specific
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+#include <configs/x86-common.h>
+
+#define CONFIG_SYS_MONITOR_LEN		(1 << 20)
+
+#define CONFIG_STD_DEVICES_SETTINGS	"stdin=serial,i8042-kbd,usbkbd\0" \
+					"stdout=serial,vidconsole\0" \
+					"stderr=serial,vidconsole\0"
+
+/* ATA/IDE support */
+#define CONFIG_SYS_IDE_MAXBUS		2
+#define CONFIG_SYS_IDE_MAXDEVICE	4
+#define CONFIG_SYS_ATA_BASE_ADDR	0
+#define CONFIG_SYS_ATA_DATA_OFFSET	0
+#define CONFIG_SYS_ATA_REG_OFFSET	0
+#define CONFIG_SYS_ATA_ALT_OFFSET	0
+#define CONFIG_SYS_ATA_IDE0_OFFSET	0x1f0
+#define CONFIG_SYS_ATA_IDE1_OFFSET	0x170
+#define CONFIG_ATAPI
+
+#endif	/* __CONFIG_H */